Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992ap%26ss.194..261r&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 194, no. 2, p. 261-301.
Astronomy and Astrophysics
Astrophysics
Bremsstrahlung, Monte Carlo Method, Solar Atmosphere, Solar Flares, Solar X-Rays, Electron Distribution, Energy Spectra, Plasma Density, X Ray Spectra
Scientific paper
An extensive examination is conducted of the characteristics of hard X-rays from solar flares with energies of at least 10 keV by means of electron Monte Carlo calculations. Fully relativistic Monte Carlo calculations are used for the multiple scattering of nonthermal electrons from X-ray and spectrometer data to study energy dispersion and angular distribution. The results are compared with observations by the ISEE and PVO spacecraft demonstrating agreement with respect to integrated X-ray flux. The X-ray source is found to be isotropic for low difference angles, and the X-ray flux ratio decreases at the start of the impulsive phase and increases at the end of the impulsive phase. The results are examined in the context of the thick-target bremsstrahlung model by Koul et al. (1985) and are found to be consistent with the corresponding low-altitude X-ray generation.
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